It's possible, but it would be tricky. WavePad has numerous noise removal features which may help in this process, but be aware that nothing is perfect and you will likely loose some clarity in the spoken words. If you're able to isolate what frequencies the words are spoken at, you could use a bandpass filter (also achievable with WavePad) to pass the words and block the rest of the audio. Have a go with the free trial version!